Upgrading the Firmware of a Three-Rack Ring
MCT Pair in Non-Clos
The firmware on the MCT leaf is
downloaded.
Enabling maintenance mode on one
of the leafs in a three-rack ring MCT leaf pair follows the same behavior as the
MCT leaf pair in a Clos topology. The only difference is the iBGP Layer 3 backup
link between MCT leaf pairs. Maintenance mode results in the traffic being
redirected to the peer MCT leaf.
The
running-configuration is saved on the first MCT leaf to
preserve all current configurations including the maintenance mode enable
configuration.
The device is rebooted for
firmware activation without traffic loss.
After the firmware is upgraded, the maintenance mode is disabled to allow
traffic again through the upgraded MCT leaf.
The
running-config is saved again to ensure the maintenance
mode config remains disabled.
The same process can be carried out on the second MCT leaf to upgrade the
firmware without traffic loss.
Three-rack ring first MCT leaf firmware upgrade with maintenance
mode
Three-rack ring second MCT leaf firmware upgrade with maintenance
mode
